Hey, what are the next steps of this PR? We could either:

1. Review and merge this now, then handle the Effekt bindings (+ a few tests) in a followup PR
2. Add the Effekt bindings (+ tests) first here, then proceed with review and merge

rough draft

extern def compare(b1: ByteArray, b2: ByteArray): Ordering = 
  llvm { llvm::compare(b1).... }

namespace llvm {

  extern def compare(b1: ByteArray, b2: ByteArray): Int
}

We'll also probably need to add it for JS, it should be roughly something like, uuuh:

function compareUint8Arrays(arr1, arr2) {
  const len = Math.min(arr1.length, arr2.length);
  
  for (let i = 0; i < len; i++) {
    if (arr1[i] !== arr2[i]) {
      return arr1[i] < arr2[i] ? -1 : 1;
    }
  }
  
  return arr1.length - arr2.length;
}

then clamp to {-1, 0, 1}, etc...

Where should I add the JS function? In effekt_builtins.js?
There are already some similar functions there which sadly do not work for this case